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[image]CHEM Study Newsletter, Volume 8, Number 1 - CHEM Study
This is the only issue of Volume 8 of the CHEM Study Newsletter, the outreach publication for the high school chemistry curriculum developed at U.C. Berkeley in the 1960s. Publication date is June, 1969.
Keywords: CHEM Study; newsletter; 1969; chemistry; chemical education
Downloads: 16
[movies]Pimentel Discusses the Hydrogen Atom - CHEM Study, College of Chemistry, U.C. Berkeley
This film was not made to be shown to students. It is a lecture by Prof. George G. Pimentel designed for teachers to reinforce background materials related to films #4148 and #4149 in the Film and Course Teachers Guides.
Keywords: chemistry; CHEM Study Film; George Pimentel
Downloads: 287
[movies]Pimentel Discusses Chemical Bonding - CHEM Study, College of Chemistry, U.C. Berkeley
Professor Pimentel amplifies the idea that attraction of one or more electrons for two or more nuclei accounts for bond formation. The virial theorem is presented and used to show that the lowering of the electron's total energy in bond formation can only occur through a lowering of its potential energy by being simultaneously near two or more nuclei. This principle is shown to apply equally well to covalent, ionic, and other types of bonding.
Keywords: chemistry; CHEM Study Film; George Pimentel
Downloads: 309
[movies]Molecular Structure and Health (A Revision of 'Biochemistry and Molecular Structure') - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
The role of molecular structure in determining biological activity is shown. The correlation of the structure of sulfanilamide with that of a vitamin essential for bacterial growth leads to a more general investigation of the biochemical nature of growth. Paper chromatography is used to separate some of the material found in chromosomes. It is proposed that compounds similar to those found in chromosomes may stop cell division and thus be useful in controlling cancer...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; biochemistry
Downloads: 674
[movies]Catalysis (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
A catalyst is shown to be a substance which speeds a reaction by providing a new reaction mechanism to an already possible reaction. The new mechanism ordinarily has a low activation energy. The catalyst reacts, then is regenerated at a later stage of the mechanism. Science Consultant: Professor Richard E. Powell, University of California, Berkeley. Wardâs Volume 3, CHEM Study #4127, 17 minutes. In color, 1989.
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; catalyst
Downloads: 242
[movies]High Temperature Research (Second Edition) - CHEM Study, Lawrence Hall of Science, U.C. Berkeley
why do we know more today than we did yesterday? One reason is that scientists engage in research. The excitement of discovering new knowledge through research is illustrated by studying the bond strength of gaseous titanium monosulfide. Gaseous TiS molecules as well as gaseous titanium and sulfur atoms are produced by the vaporization of the high melting crystalline titanium monosulfide at temperatures near 2000°K...
Keywords: CHEM Study; Sputnik-era curriculum; chemical education; science education
Downloads: 131
[movies]Molecular Spectroscopy (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Laboratory experiments, molecular models, and animation show details of the infrared light absorption process and its relation to molecular properties. The concept of natural vibrational frequencies in molecules is emphasized. The use of the infrared spectrum in identifying molecules and determining their molecular structure is demonstrated. Collaborators: Professor Bryce Crawford, Jr., and Dr. John Overend, University of Minnesota, Minneapolis...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; spectroscopy
Downloads: 494
[movies]Nitric Acid (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Nitric acid acts as an acid in the manufacture of chemical fertilizers; it acts as a base in the manufacture of nitro compounds; it acts as an oxidizing agent in many systems. In making the fertilizer ammonium nitrate from nitric acid, it is necessary to neutralize the acidity of HNO3. This is accomplished by addition of NH3. In nitration reactions, such as the making of nitrobenzene, nitric acid is made to act as a base in the presence of sulfuric acid and forms nitronium ion which is the react...
Keywords: CHEM Study; nitric acid; chemical manufacturing; science education; Sputnik-era education; chemistry; chemical education
Downloads: 393
[movies]Electric Interactions in Chemistry (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Observations of two spheres suspended from the terminals of a high voltage generator remind us of the principles that opposite charges attract, like charges repel, and uncharged bodies have no electric interaction. To determine quantitatively the effect of distance on electric force, a sensitive balance measures the force between two charged spheres. The distance is varied and the electric force is calculated from changes in balance readings...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; electron attraction; electron repulsion
Downloads: 326
[movies]Molecular Motions (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Many properties of matter such as fluidity, vaporization and rates of chemical reactions indicate that molecular motion must be occurring and that the freedom of motion increases in going from the solid to the liquid to the gaseous state. The concepts of translational, rotational, and vibrational molecular motions allow the interpretation of the observed properties. The use of animation and dynamic models makes clear how the observed properties depend on the types of motion occurring at the mole...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; molecular motion
Downloads: 372
[movies]Acid-Base Interactions (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Proton-donor-acceptor theory is used to interpret the experimental behavior of acid-base indicators. Experiments and animation show the effects on indicators of changing acidity. Equilibrium constants of four indicators are determined and the indicators arranged in order of decreasing acid strength. The competition among bases for protons is shown by mixing the indicators and showing that each changes color at different total acidity.
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; acid; base
Downloads: 511
[movies]The Hydrogen Atom - As Viewed by Quantum Mechanics (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
A description of the atom that is in accord with quantum mechanics is presented. This description explains the energy levels and line spectrum of the hydrogen atom and furnishes the basis of contemporary theory of chemical bonding. The electron position in the atom is considered in terms of probability, and the meaning of a 1s orbital is clarified with a digital computer plot, two analogies, and animation...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; quantum mechanics
Downloads: 753
[movies]Shapes and Polarities of Molecules (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Observations are made of electric effects, including deflections of streams of liquids by a charged rod, and changes in charging time of a capacitor. There is evidence that different molecules give two types of results: some give very marked interactions with electric charges, while others give little effect. To explain these different results, a conceptual model is developed based on two types of molecules: polar and non-polar...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; polar molecules; non-polar molecules; molecular structure
Downloads: 905
[movies]Vanadium - A Transition Element (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Vanadium is studied as a typical transition element. The different oxidation states of vanadium and the corresponding colors are observed and then identified by means of a quantitative titration of vanadium (II) solution with cerium (IV) solution. The oxidation states and the observed colors are correlated with the electronic structures using an orbital board. The reaction with hydroxide ion and the formation of complex ions containing vanadium in different oxidation states are demonstrated...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; vanadium; transition element
Downloads: 427
[movies]Synthesis of an Organic Compound (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
The synthesis of 2-butanone, a ketone, from 2-butanol, an alcohol, as an example of a common type of organic synthesis. Three basic steps are developed: synthesis, purification, identification. In the synthesis, 2-butanol is oxidized by sodium dichromate and sulfuric acid to yield 2-butanone. Purification is accomplished by solvent extraction with ether followed by distillation of the 2-butanone. The identity of the product is established by infrared absorption spectroscopy and then more clearly...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; organic chemistry; chemical synthesis
Downloads: 694
[movies]Gas Pressure & Molecular Collisions (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
The relationship between gaseous pressure and molecular collisions is explored. The effects on molecular collisions of varying the number of molecules per unit of volume and of varying the temperature are studied. The experimental study of the relative rates of effusion of hydrogen, oxygen, carbon dioxide and sulfur hexafluoride leads to the quantitative relationship among molecular mass, molecular velocity, and absolute temperature...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; gas pressure
Downloads: 853
[movies]Mechanism of an Organic Reaction (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
A study of the hydrolysis of the ester, methyl benzoate, shows that the discovery of a reaction mechanism includes a determination of the chemical equation, the structures of the reactants and products, the fate of each atom of the reactants, and the structures of the intermediate molecules. The concepts of bond polarity and the effect of varying the structure of the ester also provide valuable hints...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; organic chemistry
Downloads: 596
[movies]Ionization Energy (Second Edition) - CHEM Study, College of Chemistry and Lawrence Hall of Science, U.C. Berkeley
Two methods of measuring ionization energy, photo-ionization, and electron bombardment, are shown. A high vacuum system is used with a simple cell to measure electric conductivity of gases. The photo-ionization of sodium by the use of a mercury light source and a monochromator is carried out. The electron-bombardment method is then demonstrated with sodium and three noble gases. Animation shows what occurs on the atomic level during the ionization process...
Keywords: CHEM Study; chemical education; science education; Sputnik-era curriculum; ionization energy
Downloads: 2,826
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